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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <stdio.h>
#include <stdlib.h>
#include <vespa/vespalib/net/socket_address.h>
#include <vespa/vespalib/stllike/string.h>
#include <vespa/vespalib/util/stringfmt.h>
#include <vespa/vespalib/util/size_literals.h>
#include <set>
using vespalib::SocketAddress;
std::set<vespalib::string> make_ip_set() {
std::set<vespalib::string> result;
for (const auto &addr: SocketAddress::get_interfaces()) {
result.insert(addr.ip_address());
}
return result;
}
vespalib::string get_hostname() {
std::vector<char> result(4_Ki, '\0');
gethostname(&result[0], 4000);
return SocketAddress::normalize(&result[0]);
}
bool check(const vespalib::string &name, const std::set<vespalib::string> &ip_set, vespalib::string &error_msg) {
auto addr_list = SocketAddress::resolve(80, name.c_str());
if (addr_list.empty()) {
error_msg = vespalib::make_string("hostname '%s' could not be resolved", name.c_str());
return false;
}
for (const SocketAddress &addr: addr_list) {
vespalib::string ip_addr = addr.ip_address();
if (ip_set.count(ip_addr) == 0) {
error_msg = vespalib::make_string("hostname '%s' resolves to ip address not owned by this host (%s)",
name.c_str(), ip_addr.c_str());
return false;
}
}
return true;
}
int main(int, char **) {
auto my_ip_set = make_ip_set();
vespalib::string my_hostname = get_hostname();
vespalib::string my_hostname_error;
vespalib::string localhost = "localhost";
vespalib::string localhost_error;
if (check(my_hostname, my_ip_set, my_hostname_error)) {
fprintf(stdout, "%s\n", my_hostname.c_str());
} else if (check(localhost, my_ip_set, localhost_error)) {
fprintf(stderr, "WARN: hostname detection failed, falling back to local hostname: %s", localhost.c_str());
fprintf(stderr, " WARN: canonical hostname (from gethostname/getaddrinfo): %s\n", my_hostname.c_str());
fprintf(stderr, " WARN: %s\n", my_hostname_error.c_str());
fprintf(stdout, "%s\n", localhost.c_str());
} else {
fprintf(stderr, "FATAL: hostname detection failed\n");
fprintf(stderr, " INFO: canonical hostname (from gethostname/getaddrinfo): %s\n", my_hostname.c_str());
fprintf(stderr, " ERROR: %s\n", my_hostname_error.c_str());
fprintf(stderr, " INFO: falling back to local hostname: %s\n", localhost.c_str());
fprintf(stderr, " ERROR: %s\n", localhost_error.c_str());
return 1;
}
return 0;
}
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